Description:
------------
stream_context_create() causes memory leaks.

PHP version is actualy 5.2.1RC5 - latest available.

Reproduce code:
---------------
#!/www/httpd/php/cli -ne
<?php

$postdata=array_fill(0,128,"blah");
for ($a=0;$a<100;$a++){
	$options=array('http'=>array(
				'method'=>"POST",
				'request_fulluri'=>"POST http://www.google.com HTTP/1.0",
				'header'  => 'Content-type: application/x-www-form-urlencoded',
				'content' => $postdata
		)
	);
	$context=stream_context_create($options);
	unset($context,$options);
	echo "current: ",memory_get_usage()," delta: ",(memory_get_usage()-$prev)."\n";
	$prev=memory_get_usage();
}
?>

Expected result:
----------------
"current: 74496 delta: 0" line repeated.

Actual result:
--------------
current: 87368 delta: 87368
current: 100008 delta: 12520
<...many lines here>
current: 1319348 delta: 12440

As you can clearly see each iteration eatch 12kb of RAM, which it shouldn't.

If you comment the

$context=stream_context_create($options);

line out, delta in the example above will always be at 0.